Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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A Study on SEM Observations of Low Temperature Degradation in Zirconia Dental Ceramics

저온열화에 따른 치과용 지르코니아의 전자현미경 관찰 연구

  • Lee, Jung-Hwan (Dept. of dental lab. Technology, Gwang-ju Health College) ;
  • Joo, Kyu-Ji (Dept. of dental lab. Technology, Gwang-ju Health College) ;
  • Ahn, Jae-Seok (Dept. of dental lab. Technology, Gwang-ju Health College)
  • Received : 2011.02.05
  • Accepted : 2011.03.02
  • Published : 2011.03.30
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Abstract

Purpose: Thy yttria tetragonal zirconia polycrystalline(Y-TZP) is a good structural ceramic for dental restoration. But it have a problem that delamination of veneering ceramic from the Y-TZP core materials. The problem generally occur at the interface, thus this study was conducted to evaluate the interface of Y-TZP using scanning electron microscopy(SEM). Methods: To investigate this aspect, high-resolution SEM observations were made of polished and etched (HF content gel) cross-sections of the interface area. Dry and moist veneering porcelain powders were built up on the zirconia base. Results: The extent of this surface faceting is dependent upon the moisture content of the porcelain powder and the firing temperature. More moisture and higher final heating temperature accelerates the observed faceting of the Y-TZP grains at the interface to the veneering ceramic. Conclusion: These changes of the Y-TZP grains indicate that destabilization of the tetragonal phase of zirconia occurs at the interface during veneering with ceramic. It may result in a reduction of the stability of the zirconia and interface.

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References

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